用钢粒取心钻进钻穿孤石的方法

Drilling of“Isolated Stone”with the Stell-ball Core Drilling

本文通过在厦门地区大直径桩孔钻遇“孤石”的施工实践，总结了一套利用钢粒取心钻进“孤石”的技术方法，有效地解决了钻进“孤石”效率低、易偏斜、事故多的技术难题。

n the paper the authors summed up a practical method of drilling an “isolated stone”of weakly weathered granite in the construction of a large-diameter pile foundation with the steel-ball core drilling, which can greatly raise the efficiency of the construction of pile foundation when an “isolated stone”was found in the drilling of a large-diameter pile.